The charger doesn’t require any elaborate installation rituals. Electrically, it is ready to go. The supply wire is terminated with a 15A plug and an included PRCD doubles up as an adapter to plug it into a smaller 5A socket.
The “installation” is basically drilling 4 holes in a wall and fixing the charger unit to it. Doesn’t require a qualified electrician to do this. All the instructions are in the included manual. You can choose to completely skip this and simply rest or hang the unit somewhere instead. I’ll try to update this post with a picture of a hanging installation.
The one thing the manual DOES NOT tell you is that if the LED indicator on the charger doesn’t turn on after you plug it in and power it up, there is probably a disconnected LED connector inside. Take the cover off, using a Philips head screw driver, connect the two dangling white plugs together, and you’re good to go.
An electrician is only needed if the earthing at your place is faulty. The manual tells you how to check for adequate earthing. If it isn’t, I doubt Ather’s installation team can do anything about it.